Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac1a269a9aa94f8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 13:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9be12e710aac2a8d53fb5880465865de SHA-1: 265709e33f28d2826db980b3b7ffa828e77c1bef SHA-256: aac1a269a9aa94f8f559dc780f414a99dc5b276cf1de9bc303ce64ac0d922fbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The high number of external links, many pointing to PDF files on various domains, indicates a link farm or phishing attempt designed to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://equinox-e.com/upload/files/99938468242.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5bou98jf684ft3i8h4cgnn83sk/27129012154.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/34758204649.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_F75832C1FD37CFE1.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/39338305828.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/dugodurazagujokon.pdfIn PDF document text
    • https://12tiga.com/contents/files/2937220782.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/74166505113.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/51720867613.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/fewuzixadigema.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vipugam.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/jivixoforaxopod.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/52060842288.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tesasararuj.pdfIn PDF document text
    • https://beautydent.hu/editor_up/43347660787.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/pakipezurugijejogidek.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19404918781.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/siganavijabipebonekak.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sowimipabodeluxemupafuke.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/13771785499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=estenose+esof%C3%A1gica+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 20464 bytes
SHA-256: a370e03b2b68b000c2eaa44af1d05aa1f79272a07b6f116aad6517dc9b31f2a5
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 10812 bytes
SHA-256: ac8c49c6dc453ef949c12392df83b78f35d7730c3f5e09dd0c43674b46a299c2

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